Remote motor control



Aug. 8, 1933. A. s. BENJAMIN REMOTE MOTOR CONTROL Filed April 4, 1932 lwww ikm INVENTOR ABRAHAM BENJAMIN M ATTORNEY Patented Aug. .8, 1933 7 UNITEDSTATES;

V 1,921,799 REMOTE Mo'roa corrrnot Abraham S. Benjamin, Chicago, 1111., assigrro'r to'Teletype Corporation, Chicag0, lll., a Corporation of Delaware Application April;4,' 1932. "serial No. 603m a-c aimsa (01. 17 -41) invention pertains to telegraph systems using motor driven machines in'which' both'the motors and the machines are controlled by'signals transmitted over line circuits, and more 5 particularly to systems in which themotor .at

despite any unusual geographical grouping of the locations of the stations. 1

'A further object is the grouping of the transmitting and, receiving machines :of a system in such manner as toproduce a balanced ,arrangev ment of the electrical devicesirr an irregularly grouped system to secure a maximum uniformity and reliability of operation. 1 The above and other'objects of the invention are attained by groupingall of the signalling instruments upon lines arranged tobe approximately equal in electrical:characteristics radiat-v w ing from'a convenient repeating point or points,

municationsignalling. lines by a system of signalling repeaters, and uniting allof the motor 1 control lines by another system, of. repeaters wherebythe several radial lines pertaining to motor controlareunited into a signal system in which a motor control signalinnany line is reheated intofall other lines. 7

A clear understanding of the system may be had from the following description, taken in conjunction with the accompanying drawing, I in which I p ,7

Fig. 1 shows the circuits for a system of eleven V telegraph stations with one repeater, four ofthe 45 telegraph stations being equipped for transmitting,a'nd a Fig. 2 shows an alternative arrangementof the repeater.

The system,,a's s own, comprisesthe stations 1, to 11 inclusive and the repeater 12. The receiving units 13 to 23 are, located at each of the stations and theequipment of each station is arranged to be vdriven by an individualmotor 24 to 34 inclusive. Each motor maybe driven by an obvious source of power, direct or alternating;

the invention is to provide a sys-- the wiring of all motors to aicommon control' circuit maybe accomplished in a simple manner which isheld open, by the open contacts of nori- 'mally energized control relays, 35 to inclusive At each of stations 1,".4,-5 'and {i there isa transmitter 46 to 49 also driven byth e motor; and a motor controlkey 5Q;to 5 3'. l r i TA polarrepeating relayf60 at repeater liz has ;a biasingwinding 61 in series with resistzaince 6;r

in a local cirouitj'also an operating winding 63 I in afltransmitting circuit from positive battery through resistance ,64, transmitters '46, 47; rte- 65 ceiver 1 6, transmitter 48, line M -winding 16 3 and transmitter 49 to earth, This circuit-normally is closed, holding the relay 61 energized with its armature; 65 againstits uppergcontacty Any transmitter may operate the repeating relay a 61 by opening andclosing the transmitting clr cuit' in codeiman'ner, and thus operate also the receiver 16.

'7 The repeating-relay 60 by its pointe -controls all receivers other than ilfif The'circuits for the; repeated signals, extend: from' positive battery through resistance 66,- armature 65 and upper contact of relay 60, .thence through resistances 67,68, 69;,through resistance 67 and receivers 17, 15, 14,"13"to earth, through resistance 68.

.and receivers 18-, 19,; 20, to'ear th, andthrough resistance 69 andfreceivers 21, 22,;23 to earth; Theparmature 65 controls every receiver except.

"16, and any transmittermaycontrol receiver 16 n the motor control devices being, also grouped upon similar lines, then uniting 'all of the comdirectly and all other receivers through repeat 0f inductance balances all of the circuits in elec-.

trical characteristics and makes "all of "them' equally fast in response to the transmitters and: gives the best arrangement for reliable opera-f tion.

The motor-control system is electrically separate from the line wire 70, and comprises three control wires 71, 72, 73,"which are connected at the repeater stationdz -to a" control repe'ater'of any desired type,- and which-vare connected at: the operating stations toall of the r'n'otor-controlf.

relays 35 to 45, andto all of themotor-control keys 50 to 53.

The motor -vcontroljrepeater at-station l l comprises four relays 73; '74, '75, '16. Relay '73 is 2 double-wound and normally is in energized condition by current from positive battery through resistance '77, left hand winding of relay '73, left hand armature and back contact of relay '75, wire '71, closed key 51, relays 38, 3'7, 36, and closed key 50 to earth. Relay '74 is also double-- wound and normally is in energized condition by current from positive battery, through resistance'78, left handwinding of relay '74, left hand armature and back contact of relay '76, wire '72, closed key 52, relays 39, 40, 41, 42 and closed key 53 to earth.

Relay '73 controls a first local circuit from positive battery through resistance 80, armature and back contact of relay '73, right hand winding and then right hand armature and front contact of relay 74 and winding of relay '76 to earth. Relay '74 controls a second local circuit from positive battery through resistance 81, left hand armature and back contact of relay '74, right hand winding of relay '73 and winding of relay '75 to earth. A control line circuit extends from positive battery through resistance 82, right hand armatures and back contacts of relays '75 and p 76, line wire'73, and relays 43, 44, to earth.

' The three line circuits traced over line wires .71,

'72, 73 are normally closed when the system is I not. operating tosend messageaand all relays. 35

to 45 are normally in energized condition, as

shown,'with all motors 24 to 34 non-operatingas' a result of this energized condition of their controlling relays.

For operation, the opening of any starting key to 53 will deenergize all motor-control relays and start all motors in the system.

The operator at station 1 or station 4 may open key 50. or 51 which will open line '71 and will deenergize relay '73 which by the first local circuit will hold relay '74 energizedand will energiz'e relay '76 to open lines '72 and '73. 'All motor-, control relays 35 to 45 will be deenergized and all motors'24 to 34 will be operated. Transmitter 46 at station 1 or transmitter 47 at station 4 (or transmitter 43 or 49) may send a message to all receiver's. At the conclusion of the message, the

closing of key 50 or 51 will close the circuit of line '71 and will energize relays 35, 36, 3'7, 38 and '73.-- Relays 35 to 38 will stop motors 24 to 2'7. Relay '73 will open the first local circuit above described and will deenergize relays '76'and '74.

Relay 76' will close lines '72 and '73, energizing relays '74 and 39 to 45, to stop motors 28 to 34.

The operator 'at station 5 or at station 8 may open key 52 or 53 which will open line '72 and will deenergize relay '74 which by the second local circuit will hold relay '73 energized and will ener- '75 will close the lines '71 and '73, energizing relays .glze relay '75 to open lines '71 and'73.

All motor control relays 35 to 45 will consequently be deenerglzed 'and'all motors 24 to 34 will be operated. Any transmitter may send a message to all receivers. The reclosing of key 52 or 53 will close line-72 and will energize relays 39, 40, 41, 42 and '74. Relays 39 to 42 will stop motors 28 to 31 and relay '74 will open the second local cir- 35, 36, 37, 38, 43; 44, 45 and '73, to stop motors 24 to 2'7 and 32 to 34. I

An alternative arrangement of repeater is shown in Fig. 2. The relay 50 of Fig. 1 is replacedby three relays, 90, 91, 920i Fig. 2 whose line windings are in series in the circuit of line wire "70, and whose local windings may be in series also. Thethree relays are operated simultaneously bycontrol from line 70, and the three line sections.

armatures supply signal currents separately from the source of current through resistances Q3, 94, 95 respectively to the resistances 67, 68, 69

and thence to the telegraphic line circuits as shown connected tothose resistancesin Fig. 1.

Although the invention has been described in connection with a s ecific form thereof it will repeater operating to open the other section when one section is opened.

2. In a signalingsystem, a plurality of re ceivers, a plurality of radial line sections, said receivers divided into groups and connected in said radial line sections with approximately equal electrical characteristics in each section, and repeating relays at a point common to said sections and connecting said sections together for telegraphic transmission. 7 I J 3. In a signaling system, a plurality of receivers, a plurality of radial linesections, said receivers divided into groups and connected in said radial line sections with approximately equal electrical characteristics in each section, and a sole repeating relay at 'a point common to said sections andconnecting said sections together for telegraphic transmission, said repeating relay havinga sole operating winding in one of said 4. In a motor control system, telegraph stations, a telegraphic transmission line, a motor at each of said stations, a pl rality of motorcontrol line sections interconnecting said stations, motor-control relays in said line sections, and a control repeater connecting together said motorcontrol line sections.

5. In a motor-control system, telegraph stations, transmission circuits interconnecting said stations, a motor at each of said stations, a plurality of control-line sections interconnecting said stations, amot'or-control relay at each of said stations and connected in said line sections,iamotor control repeater connecting said line secs tions, and a motor-control key at each of said stations and connected in said line sections.

6. In a motor-control system, telegraph stations, transmission circuits interconnecting said stations, a motor at each of said stations, a plu-, I

rality of control-line sections interconnecting said stations, motor-control relays at said stations and in said line sections, a control repeater connecting two of said control-line sections to 'repeat a signal from eithersection into the other section, motor-control keys in the said connected line sectionsQand another 'control-line-section connected to said repeaterand into which said repeater repeats a signal from either. of said first mentioned two connected control-line-sections. a

7. In a motor-control system, telegraph stations, a motor at each of said stations, a telegraphic communication circuit interconnecting said stations, a plurality of closed-circuit motorcontrol line sections radiating from acommon point, motor-controllong relays in each of said line sections, relay-controlling keys in said line tions, a motor at each of said stations, 9. telegraphic communication circuit interconnecting v said stations, a plurality of closed-circuit motorcontrol line sectionsradiating from a common point, motor-controlling relays in each or said line sections, relay-controlling keys in said linesections and adapted to open a line section, and

relays connecting said sections and. operating to open all other sections when one section is opened by one 01 said keys. a v v w ABRAHAM S. BENJAMIN. 

